drivers/input/touchscreen/cy8ctmg110_ts.c

   1 /*
   2  * Driver for cypress touch screen controller
   3  *
   4  * Copyright (c) 2009 Aava Mobile
   5  *
   6  * Some cleanups by Alan Cox <alan@linux.intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/input.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/i2c.h>
  29 #include <linux/gpio.h>
  30 #include <linux/input/cy8ctmg110_pdata.h>
  31
  32 #define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"
  33
  34 /* Touch coordinates */
  35 #define CY8CTMG110_X_MIN                0
  36 #define CY8CTMG110_Y_MIN                0
  37 #define CY8CTMG110_X_MAX                759
  38 #define CY8CTMG110_Y_MAX                465
  39
  40
  41 /* cy8ctmg110 register definitions */
  42 #define CY8CTMG110_TOUCH_WAKEUP_TIME    0
  43 #define CY8CTMG110_TOUCH_SLEEP_TIME     2
  44 #define CY8CTMG110_TOUCH_X1             3
  45 #define CY8CTMG110_TOUCH_Y1             5
  46 #define CY8CTMG110_TOUCH_X2             7
  47 #define CY8CTMG110_TOUCH_Y2             9
  48 #define CY8CTMG110_FINGERS              11
  49 #define CY8CTMG110_GESTURE              12
  50 #define CY8CTMG110_REG_MAX              13
  51
  52
  53 /*
  54  * The touch driver structure.
  55  */
  56 struct cy8ctmg110 {
  57         struct input_dev *input;
  58         char phys[32];
  59         struct i2c_client *client;
  60         int reset_pin;
  61         int irq_pin;
  62 };
  63
  64 /*
  65  * cy8ctmg110_power is the routine that is called when touch hardware
  66  * will powered off or on.
  67  */
  68 static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
  69 {
  70         if (ts->reset_pin)
  71                 gpio_direction_output(ts->reset_pin, 1 - poweron);
  72 }
  73
  74 static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
  75                 unsigned char len, unsigned char *value)
  76 {
  77         struct i2c_client *client = tsc->client;
  78         int ret;
  79         unsigned char i2c_data[6];
  80
  81         BUG_ON(len > 5);
  82
  83         i2c_data[0] = reg;
  84         memcpy(i2c_data + 1, value, len);
  85
  86         ret = i2c_master_send(client, i2c_data, len + 1);
  87         if (ret != 1) {
  88                 dev_err(&client->dev, "i2c write data cmd failed\n");
  89                 return ret ? ret : -EIO;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
  96                 unsigned char *data, unsigned char len, unsigned char cmd)
  97 {
  98         struct i2c_client *client = tsc->client;
  99         int ret;
 100         struct i2c_msg msg[2] = {
 101                 /* first write slave position to i2c devices */
 102                 { client->addr, 0, 1, &cmd },
 103                 /* Second read data from position */
 104                 { client->addr, I2C_M_RD, len, data }
 105         };
 106
 107         ret = i2c_transfer(client->adapter, msg, 2);
 108         if (ret < 0)
 109                 return ret;
 110
 111         return 0;
 112 }
 113
 114 static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
 115 {
 116         struct input_dev *input = tsc->input;
 117         unsigned char reg_p[CY8CTMG110_REG_MAX];
 118         int x, y;
 119
 120         memset(reg_p, 0, CY8CTMG110_REG_MAX);
 121
 122         /* Reading coordinates */
 123         if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
 124                 return -EIO;
 125
 126         y = reg_p[2] << 8 | reg_p[3];
 127         x = reg_p[0] << 8 | reg_p[1];
 128
 129         /* Number of touch */
 130         if (reg_p[8] == 0) {
 131                 input_report_key(input, BTN_TOUCH, 0);
 132         } else  {
 133                 input_report_key(input, BTN_TOUCH, 1);
 134                 input_report_abs(input, ABS_X, x);
 135                 input_report_abs(input, ABS_Y, y);
 136         }
 137
 138         input_sync(input);
 139
 140         return 0;
 141 }
 142
 143 static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
 144 {
 145         unsigned char reg_p[3];
 146
 147         if (sleep) {
 148                 reg_p[0] = 0x00;
 149                 reg_p[1] = 0xff;
 150                 reg_p[2] = 5;
 151         } else {
 152                 reg_p[0] = 0x10;
 153                 reg_p[1] = 0xff;
 154                 reg_p[2] = 0;
 155         }
 156
 157         return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
 158 }
 159
 160 static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
 161 {
 162         struct cy8ctmg110 *tsc = dev_id;
 163
 164         cy8ctmg110_touch_pos(tsc);
 165
 166         return IRQ_HANDLED;
 167 }
 168
 169 static int __devinit cy8ctmg110_probe(struct i2c_client *client,
 170                                         const struct i2c_device_id *id)
 171 {
 172         const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
 173         struct cy8ctmg110 *ts;
 174         struct input_dev *input_dev;
 175         int err;
 176
 177         /* No pdata no way forward */
 178         if (pdata == NULL) {
 179                 dev_err(&client->dev, "no pdata\n");
 180                 return -ENODEV;
 181         }
 182
 183         if (!i2c_check_functionality(client->adapter,
 184                                         I2C_FUNC_SMBUS_READ_WORD_DATA))
 185                 return -EIO;
 186
 187         ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
 188         input_dev = input_allocate_device();
 189         if (!ts || !input_dev) {
 190                 err = -ENOMEM;
 191                 goto err_free_mem;
 192         }
 193
 194         ts->client = client;
 195         ts->input = input_dev;
 196
 197         snprintf(ts->phys, sizeof(ts->phys),
 198                  "%s/input0", dev_name(&client->dev));
 199
 200         input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
 201         input_dev->phys = ts->phys;
 202         input_dev->id.bustype = BUS_I2C;
 203         input_dev->dev.parent = &client->dev;
 204
 205         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 206         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 207
 208         input_set_abs_params(input_dev, ABS_X,
 209                         CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
 210         input_set_abs_params(input_dev, ABS_Y,
 211                         CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
 212
 213         if (ts->reset_pin) {
 214                 err = gpio_request(ts->reset_pin, NULL);
 215                 if (err) {
 216                         dev_err(&client->dev,
 217                                 "Unable to request GPIO pin %d.\n",
 218                                 ts->reset_pin);
 219                         goto err_free_mem;
 220                 }
 221         }
 222
 223         cy8ctmg110_power(ts, true);
 224         cy8ctmg110_set_sleepmode(ts, false);
 225
 226         err = gpio_request(ts->irq_pin, "touch_irq_key");
 227         if (err < 0) {
 228                 dev_err(&client->dev,
 229                         "Failed to request GPIO %d, error %d\n",
 230                         ts->irq_pin, err);
 231                 goto err_shutoff_device;
 232         }
 233
 234         err = gpio_direction_input(ts->irq_pin);
 235         if (err < 0) {
 236                 dev_err(&client->dev,
 237                         "Failed to configure input direction for GPIO %d, error %d\n",
 238                         ts->irq_pin, err);
 239                 goto err_free_irq_gpio;
 240         }
 241
 242         client->irq = gpio_to_irq(ts->irq_pin);
 243         if (client->irq < 0) {
 244                 err = client->irq;
 245                 dev_err(&client->dev,
 246                         "Unable to get irq number for GPIO %d, error %d\n",
 247                         ts->irq_pin, err);
 248                 goto err_free_irq_gpio;
 249         }
 250
 251         err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
 252                                    IRQF_TRIGGER_RISING, "touch_reset_key", ts);
 253         if (err < 0) {
 254                 dev_err(&client->dev,
 255                         "irq %d busy? error %d\n", client->irq, err);
 256                 goto err_free_irq_gpio;
 257         }
 258
 259         err = input_register_device(input_dev);
 260         if (err)
 261                 goto err_free_irq;
 262
 263         i2c_set_clientdata(client, ts);
 264         device_init_wakeup(&client->dev, 1);
 265         return 0;
 266
 267 err_free_irq:
 268         free_irq(client->irq, ts);
 269 err_free_irq_gpio:
 270         gpio_free(ts->irq_pin);
 271 err_shutoff_device:
 272         cy8ctmg110_set_sleepmode(ts, true);
 273         cy8ctmg110_power(ts, false);
 274         if (ts->reset_pin)
 275                 gpio_free(ts->reset_pin);
 276 err_free_mem:
 277         input_free_device(input_dev);
 278         kfree(ts);
 279         return err;
 280 }
 281
 282 #ifdef CONFIG_PM
 283 static int cy8ctmg110_suspend(struct device *dev)
 284 {
 285         struct i2c_client *client = to_i2c_client(dev);
 286         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 287
 288         if (device_may_wakeup(&client->dev))
 289                 enable_irq_wake(client->irq);
 290         else {
 291                 cy8ctmg110_set_sleepmode(ts, true);
 292                 cy8ctmg110_power(ts, false);
 293         }
 294         return 0;
 295 }
 296
 297 static int cy8ctmg110_resume(struct device *dev)
 298 {
 299         struct i2c_client *client = to_i2c_client(dev);
 300         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 301
 302         if (device_may_wakeup(&client->dev))
 303                 disable_irq_wake(client->irq);
 304         else {
 305                 cy8ctmg110_power(ts, true);
 306                 cy8ctmg110_set_sleepmode(ts, false);
 307         }
 308         return 0;
 309 }
 310
 311 static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
 312 #endif
 313
 314 static int __devexit cy8ctmg110_remove(struct i2c_client *client)
 315 {
 316         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 317
 318         cy8ctmg110_set_sleepmode(ts, true);
 319         cy8ctmg110_power(ts, false);
 320
 321         free_irq(client->irq, ts);
 322         input_unregister_device(ts->input);
 323         gpio_free(ts->irq_pin);
 324         if (ts->reset_pin)
 325                 gpio_free(ts->reset_pin);
 326         kfree(ts);
 327
 328         return 0;
 329 }
 330
 331 static struct i2c_device_id cy8ctmg110_idtable[] = {
 332         { CY8CTMG110_DRIVER_NAME, 1 },
 333         { }
 334 };
 335
 336 MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
 337
 338 static struct i2c_driver cy8ctmg110_driver = {
 339         .driver         = {
 340                 .owner  = THIS_MODULE,
 341                 .name   = CY8CTMG110_DRIVER_NAME,
 342 #ifdef CONFIG_PM
 343                 .pm     = &cy8ctmg110_pm,
 344 #endif
 345         },
 346         .id_table       = cy8ctmg110_idtable,
 347         .probe          = cy8ctmg110_probe,
 348         .remove         = __devexit_p(cy8ctmg110_remove),
 349 };
 350
 351 static int __init cy8ctmg110_init(void)
 352 {
 353         return i2c_add_driver(&cy8ctmg110_driver);
 354 }
 355
 356 static void __exit cy8ctmg110_exit(void)
 357 {
 358         i2c_del_driver(&cy8ctmg110_driver);
 359 }
 360
 361 module_init(cy8ctmg110_init);
 362 module_exit(cy8ctmg110_exit);
 363
 364 MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
 365 MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
 366 MODULE_LICENSE("GPL v2");